Citation: Xiaojiang Yao, Li Chen, Tingting Kong, Shimin Ding, Qiong Luo, Fumo Yang. Support effect of the supported ceria-based catalysts during NH₃-SCR reaction[J]. Chinese Journal of Catalysis, ;2017, 38(8): 1423-1430. shu

Support effect of the supported ceria-based catalysts during NH₃-SCR reaction

Xiaojiang Yao ^a,b,c, ,
Li Chen ^c,d ,
Tingting Kong ^a,c ,
Shimin Ding ^a ,
Qiong Luo ^c ,
Fumo Yang ^a,b,c,d

a Collaborative Innovation Center for Green Development in Wuling Mountain Areas, Yangtze Normal University, Chongqing 408100, China;
b Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, Fujian, China;
c Research Center for Atmospheric Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China;
d School of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400045, China

Received Date: 15 May 2017
Revised Date: 7 June 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (21507130), the Chongqing Science and Technology Commission (cstc2016jcyjA0070, cstc2014pt-gc20002, cstc2014yykfC20003, cstckjcxljrc13), and the Open Project Program of Chongqing Key Laboratory of Catalysis and Functional Organic Molecules from Chongqing Technology and Business University (1456029).

To investigate how the physicochemical properties and NH₃-selective catalytic reduction (NH₃-SCR) performance of supported ceria-based catalysts are influenced as a function of support type, a series of CeO₂/SiO₂, CeO₂/γ-Al₂O₃, CeO₂/ZrO₂, and CeO₂/TiO₂ catalysts were prepared. The physicochemical properties were probed by means of X-ray diffraction, Raman spectroscopy, Brunauer-Emmett-Teller surface area measurements, X-ray photoelectron spectroscopy, H₂-temperature programmed reduction, and NH₃-temperature programmed desorption. Furthermore, the supported ceria-based catalysts' catalytic performance and H₂O + SO₂ tolerance were evaluated by the NH₃-SCR model reaction. The results indicate that out of the supported ceria-based catalysts studied, the CeO₂/γ-Al₂O₃ catalyst exhibits the highest catalytic activity as a result of having a high relative Ce³⁺/Ce⁴⁺ ratio, optimum reduction behavior, and the largest total acid site concentration. Finally, the CeO₂/γ-Al₂O₃ catalyst also presents excellent H₂O + SO₂ tolerance during the NH₃-SCR process.
- Support effect,
- Supported ceria-based catalyst,
- Reduction behavior,
- Surface acidity,
- Ammonia-selective catalytic reduction
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Support effect of the supported ceria-based catalysts during NH₃-SCR reaction